Quaternary Geology of the Echigo Plain, Niigata, Japan.

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  • 越後平野地下の第四系
  • エチゴ ヘイヤ チカ ノ ダイ4ケイ

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Abstract

Quaternary deposits of the Echigo Plain are very thick compared with the other Japanese plains. The maximum of thickness is more than 3, 500m around Niigata. The Quaternary Echigo Plain sedimentary basin is long from south to north, and the deposits form a large-scaled syncline. Large faults or steep dipped zones are distributed along both sides of the plain.<br>These Quaternary deposits are divided into several formations: in ascending order, the Nishiyama and Haizume Formations, the unnamed Middle Pleistocene, the Kanbara Group, buried terrace deposits, the Nishikanbara, Shirone and Kurotori Formations. The upper half of the Nishiyama Formation was deposited in Early Pleistocene time and is composed of bathyal mudstones and sandstones with a Globorotalia inflata bed. The Haizume Formation is of the same age and composed of bathyal mudstones with Globorotalia inflata bed. The unnamed Middle Pleistocene consists mainly of bathyal to shallow marine facies. The Kanbara Group consists of shallow marine and delta facies which are composed of alternative beds of silt and sandy gravels with fossils of shallow marine species. Buried terrace deposits are covered unconformably by latest Late Pleistocene and Holocene sediments. The Nishikanbara Formation is latest Late Pleistocene deposits which consist of fluvial gravels. The Shirone Formation is latest Late Pleistocene and Holocene in age and composed of alternative beds of silts and sands with peat beds, and silts with marine silty beds. The Kurotori Formation is the Holocene and consists of muds and sands with peat beds.

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